The point at which a river empties into another body of water, usually a gulf, bay, sea, or ocean, is called the river's mouth. Rivers may or may not have a delta, which is a land area built by silt that was transported by the river.
Deltas
It flows into the Gulf of Mexico.
This river flows into the Gulf of Mexico, AKA the Pacific Ocean
It flows into the Gulf of St. Lawrence, which also flows into the North Atlantic Ocean. :)
The Rio Grande River flows into the Gulf of Mexico which is a marginal sea of the Atlantic Ocean.
The Niger River flows through the Niger Delta into the Bight of Biafra in the Gulf of Guinea on the Atlantic Ocean.
No...it actually flows into the Atlantic Ocean.
The Gila River flows in the Colorado River, and from there the Colorado runs in to the Gulf of California.
The Rhone River flows into the Gulf of Lions.
It flows into the Gulf of Saint Lawrence and Atlantic Ocean
The Pacific ocean cause the Mississippi river flows into the Atlantic ocean and the Rio Grande river flows into the Gulf of Mexico and the Pacific is in the west.
The St. Lawrence River flows into the Gulf of St. Lawrence at it terminus. At its origin the St. Lawrence begins at Lake Ontario flowing Northwest to the Gulf.